summaryrefslogtreecommitdiffstats
path: root/sound/soc/codecs/ad1836.c
blob: 2e360c2430759a476ba0b5e1e6b0848665742952 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
/*
 * File:         sound/soc/codecs/ad1836.c
 * Author:       Barry Song <Barry.Song@analog.com>
 *
 * Created:      Aug 04 2009
 * Description:  Driver for AD1836 sound chip
 *
 * Modified:
 *               Copyright 2009 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <sound/tlv.h>
#include <sound/soc-dapm.h>
#include <linux/spi/spi.h>
#include "ad1836.h"

/* codec private data */
struct ad1836_priv {
	struct snd_soc_codec codec;
	u16 reg_cache[AD1836_NUM_REGS];
};

static struct snd_soc_codec *ad1836_codec;
struct snd_soc_codec_device soc_codec_dev_ad1836;
static int ad1836_register(struct ad1836_priv *ad1836);
static void ad1836_unregister(struct ad1836_priv *ad1836);

/*
 * AD1836 volume/mute/de-emphasis etc. controls
 */
static const char *ad1836_deemp[] = {"None", "44.1kHz", "32kHz", "48kHz"};

static const struct soc_enum ad1836_deemp_enum =
	SOC_ENUM_SINGLE(AD1836_DAC_CTRL1, 8, 4, ad1836_deemp);

static const struct snd_kcontrol_new ad1836_snd_controls[] = {
	/* DAC volume control */
	SOC_DOUBLE_R("DAC1 Volume", AD1836_DAC_L1_VOL,
			AD1836_DAC_R1_VOL, 0, 0x3FF, 0),
	SOC_DOUBLE_R("DAC2 Volume", AD1836_DAC_L2_VOL,
			AD1836_DAC_R2_VOL, 0, 0x3FF, 0),
	SOC_DOUBLE_R("DAC3 Volume", AD1836_DAC_L3_VOL,
			AD1836_DAC_R3_VOL, 0, 0x3FF, 0),

	/* ADC switch control */
	SOC_DOUBLE("ADC1 Switch", AD1836_ADC_CTRL2, AD1836_ADCL1_MUTE,
		AD1836_ADCR1_MUTE, 1, 1),
	SOC_DOUBLE("ADC2 Switch", AD1836_ADC_CTRL2, AD1836_ADCL2_MUTE,
		AD1836_ADCR2_MUTE, 1, 1),

	/* DAC switch control */
	SOC_DOUBLE("DAC1 Switch", AD1836_DAC_CTRL2, AD1836_DACL1_MUTE,
		AD1836_DACR1_MUTE, 1, 1),
	SOC_DOUBLE("DAC2 Switch", AD1836_DAC_CTRL2, AD1836_DACL2_MUTE,
		AD1836_DACR2_MUTE, 1, 1),
	SOC_DOUBLE("DAC3 Switch", AD1836_DAC_CTRL2, AD1836_DACL3_MUTE,
		AD1836_DACR3_MUTE, 1, 1),

	/* ADC high-pass filter */
	SOC_SINGLE("ADC High Pass Filter Switch", AD1836_ADC_CTRL1,
			AD1836_ADC_HIGHPASS_FILTER, 1, 0),

	/* DAC de-emphasis */
	SOC_ENUM("Playback Deemphasis", ad1836_deemp_enum),
};

static const struct snd_soc_dapm_widget ad1836_dapm_widgets[] = {
	SND_SOC_DAPM_DAC("DAC", "Playback", AD1836_DAC_CTRL1,
				AD1836_DAC_POWERDOWN, 1),
	SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_SUPPLY("ADC_PWR", AD1836_ADC_CTRL1,
				AD1836_ADC_POWERDOWN, 1, NULL, 0),
	SND_SOC_DAPM_OUTPUT("DAC1OUT"),
	SND_SOC_DAPM_OUTPUT("DAC2OUT"),
	SND_SOC_DAPM_OUTPUT("DAC3OUT"),
	SND_SOC_DAPM_INPUT("ADC1IN"),
	SND_SOC_DAPM_INPUT("ADC2IN"),
};

static const struct snd_soc_dapm_route audio_paths[] = {
	{ "DAC", NULL, "ADC_PWR" },
	{ "ADC", NULL, "ADC_PWR" },
	{ "DAC1OUT", "DAC1 Switch", "DAC" },
	{ "DAC2OUT", "DAC2 Switch", "DAC" },
	{ "DAC3OUT", "DAC3 Switch", "DAC" },
	{ "ADC", "ADC1 Switch", "ADC1IN" },
	{ "ADC", "ADC2 Switch", "ADC2IN" },
};

/*
 * DAI ops entries
 */

static int ad1836_set_dai_fmt(struct snd_soc_dai *codec_dai,
		unsigned int fmt)
{
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	/* at present, we support adc aux mode to interface with
	 * blackfin sport tdm mode
	 */
	case SND_SOC_DAIFMT_DSP_A:
		break;
	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_IB_IF:
		break;
	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	/* ALCLK,ABCLK are both output, AD1836 can only be master */
	case SND_SOC_DAIFMT_CBM_CFM:
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int ad1836_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params,
		struct snd_soc_dai *dai)
{
	int word_len = 0;

	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_device *socdev = rtd->socdev;
	struct snd_soc_codec *codec = socdev->card->codec;

	/* bit size */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		word_len = 3;
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
		word_len = 1;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
	case SNDRV_PCM_FORMAT_S32_LE:
		word_len = 0;
		break;
	}

	snd_soc_update_bits(codec, AD1836_DAC_CTRL1,
		AD1836_DAC_WORD_LEN_MASK, word_len);

	snd_soc_update_bits(codec, AD1836_ADC_CTRL2,
		AD1836_ADC_WORD_LEN_MASK, word_len);

	return 0;
}


/*
 * interface to read/write ad1836 register
 */
#define AD1836_SPI_REG_SHFT 12
#define AD1836_SPI_READ     (1 << 11)
#define AD1836_SPI_VAL_MSK  0x3FF

/*
 * write to the ad1836 register space
 */

static int ad1836_write_reg(struct snd_soc_codec *codec, unsigned int reg,
		unsigned int value)
{
	u16 *reg_cache = codec->reg_cache;
	int ret = 0;

	if (value != reg_cache[reg]) {
		unsigned short buf;
		struct spi_transfer t = {
			.tx_buf = &buf,
			.len = 2,
		};
		struct spi_message m;

		buf = (reg << AD1836_SPI_REG_SHFT) |
			(value & AD1836_SPI_VAL_MSK);
		spi_message_init(&m);
		spi_message_add_tail(&t, &m);
		ret = spi_sync(codec->control_data, &m);
		if (ret == 0)
			reg_cache[reg] = value;
	}

	return ret;
}

/*
 * read from the ad1836 register space cache
 */
static unsigned int ad1836_read_reg_cache(struct snd_soc_codec *codec,
					  unsigned int reg)
{
	u16 *reg_cache = codec->reg_cache;

	if (reg >= codec->reg_cache_size)
		return -EINVAL;

	return reg_cache[reg];
}

static int __devinit ad1836_spi_probe(struct spi_device *spi)
{
	struct snd_soc_codec *codec;
	struct ad1836_priv *ad1836;

	ad1836 = kzalloc(sizeof(struct ad1836_priv), GFP_KERNEL);
	if (ad1836 == NULL)
		return -ENOMEM;

	codec = &ad1836->codec;
	codec->control_data = spi;
	codec->dev = &spi->dev;

	dev_set_drvdata(&spi->dev, ad1836);

	return ad1836_register(ad1836);
}

static int __devexit ad1836_spi_remove(struct spi_device *spi)
{
	struct ad1836_priv *ad1836 = dev_get_drvdata(&spi->dev);

	ad1836_unregister(ad1836);
	return 0;
}

static struct spi_driver ad1836_spi_driver = {
	.driver = {
		.name	= "ad1836",
		.owner	= THIS_MODULE,
	},
	.probe		= ad1836_spi_probe,
	.remove		= __devexit_p(ad1836_spi_remove),
};

static struct snd_soc_dai_ops ad1836_dai_ops = {
	.hw_params = ad1836_hw_params,
	.set_fmt = ad1836_set_dai_fmt,
};

/* codec DAI instance */
struct snd_soc_dai ad1836_dai = {
	.name = "AD1836",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 2,
		.channels_max = 6,
		.rates = SNDRV_PCM_RATE_48000,
		.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
			SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
	},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 2,
		.channels_max = 4,
		.rates = SNDRV_PCM_RATE_48000,
		.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
			SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
	},
	.ops = &ad1836_dai_ops,
};
EXPORT_SYMBOL_GPL(ad1836_dai);

static int ad1836_register(struct ad1836_priv *ad1836)
{
	int ret;
	struct snd_soc_codec *codec = &ad1836->codec;

	if (ad1836_codec) {
		dev_err(codec->dev, "Another ad1836 is registered\n");
		return -EINVAL;
	}

	mutex_init(&codec->mutex);
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);
	codec->private_data = ad1836;
	codec->reg_cache = ad1836->reg_cache;
	codec->reg_cache_size = AD1836_NUM_REGS;
	codec->name = "AD1836";
	codec->owner = THIS_MODULE;
	codec->dai = &ad1836_dai;
	codec->num_dai = 1;
	codec->write = ad1836_write_reg;
	codec->read = ad1836_read_reg_cache;
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);

	ad1836_dai.dev = codec->dev;
	ad1836_codec = codec;

	/* default setting for ad1836 */
	/* de-emphasis: 48kHz, power-on dac */
	codec->write(codec, AD1836_DAC_CTRL1, 0x300);
	/* unmute dac channels */
	codec->write(codec, AD1836_DAC_CTRL2, 0x0);
	/* high-pass filter enable, power-on adc */
	codec->write(codec, AD1836_ADC_CTRL1, 0x100);
	/* unmute adc channles, adc aux mode */
	codec->write(codec, AD1836_ADC_CTRL2, 0x180);
	/* left/right diff:PGA/MUX */
	codec->write(codec, AD1836_ADC_CTRL3, 0x3A);
	/* volume */
	codec->write(codec, AD1836_DAC_L1_VOL, 0x3FF);
	codec->write(codec, AD1836_DAC_R1_VOL, 0x3FF);
	codec->write(codec, AD1836_DAC_L2_VOL, 0x3FF);
	codec->write(codec, AD1836_DAC_R2_VOL, 0x3FF);
	codec->write(codec, AD1836_DAC_L3_VOL, 0x3FF);
	codec->write(codec, AD1836_DAC_R3_VOL, 0x3FF);

	ret = snd_soc_register_codec(codec);
	if (ret != 0) {
		dev_err(codec->dev, "Failed to register codec: %d\n", ret);
		kfree(ad1836);
		return ret;
	}

	ret = snd_soc_register_dai(&ad1836_dai);
	if (ret != 0) {
		dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
		snd_soc_unregister_codec(codec);
		kfree(ad1836);
		return ret;
	}

	return 0;
}

static void ad1836_unregister(struct ad1836_priv *ad1836)
{
	snd_soc_unregister_dai(&ad1836_dai);
	snd_soc_unregister_codec(&ad1836->codec);
	kfree(ad1836);
	ad1836_codec = NULL;
}

static int ad1836_probe(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec;
	int ret = 0;

	if (ad1836_codec == NULL) {
		dev_err(&pdev->dev, "Codec device not registered\n");
		return -ENODEV;
	}

	socdev->card->codec = ad1836_codec;
	codec = ad1836_codec;

	/* register pcms */
	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	if (ret < 0) {
		dev_err(codec->dev, "failed to create pcms: %d\n", ret);
		goto pcm_err;
	}

	snd_soc_add_controls(codec, ad1836_snd_controls,
			     ARRAY_SIZE(ad1836_snd_controls));
	snd_soc_dapm_new_controls(codec, ad1836_dapm_widgets,
				  ARRAY_SIZE(ad1836_dapm_widgets));
	snd_soc_dapm_add_routes(codec, audio_paths, ARRAY_SIZE(audio_paths));
	snd_soc_dapm_new_widgets(codec);

	return ret;

card_err:
	snd_soc_free_pcms(socdev);
	snd_soc_dapm_free(socdev);
pcm_err:
	return ret;
}

/* power down chip */
static int ad1836_remove(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	snd_soc_free_pcms(socdev);
	snd_soc_dapm_free(socdev);

	return 0;
}

struct snd_soc_codec_device soc_codec_dev_ad1836 = {
	.probe = 	ad1836_probe,
	.remove = 	ad1836_remove,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_ad1836);

static int __init ad1836_init(void)
{
	int ret;

	ret = spi_register_driver(&ad1836_spi_driver);
	if (ret != 0) {
		printk(KERN_ERR "Failed to register ad1836 SPI driver: %d\n",
				ret);
	}

	return ret;
}
module_init(ad1836_init);

static void __exit ad1836_exit(void)
{
	spi_unregister_driver(&ad1836_spi_driver);
}
module_exit(ad1836_exit);

MODULE_DESCRIPTION("ASoC ad1836 driver");
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud